Quartz lamp



v F. GIRARD QUARTZ LAMP Filed Aug. 24, 1921 Patented Dec. 8, 1925.

FRITZ GIRARD, OIS HANAU-ON -THE1IAIN, GERMANY.

QUARTZ LAME.

Application filed August 24, 1921. Serial No. 494,981.

(GRANTED UN)ER THE PROVISIONS OF THE AGT OF MARCH S, 1921, 41 STAT. L., 1313.)

T0 aZZ w7aom z't may (ronce m: 7

Be it known that I, FRITZ GIRARD, a citi zen of Germany, residing at Hanau-on-the- Main, Germany, have invented certain new and useful Improvements in Quartz Lampe (for which I have filed applications for patents as follows: Germany, June 13, 1914-, Patent 287055; England, June 14:, 1915, Patent 8753/15; France, J une 12, 1915, Patent 511314; Austria, June 12, 1915, Patent 73952; Hungary, June 11, 1915, Patent 69160), of which the following is a specification.

My invention refers to quartz lamps and 9 more particularly to a safety device for use in ccnnect1on w1th such lamps.

It is an object of my invention to protect the persons using such lamps from getting injured in the case of a lamp breaking.

As is well known to those skilled in the art, there is a deect inherent in quartz lamps which 1esides in the fact that if a lamp should break When in use incandescent particles of quartz drop and the boiling hot mcrcury fiows out. Such breakage is net 01 great importance in the case of quartz lampe that are employed for illuminating purposes as such lamps are provided with glass globes. It is diierent, however, with quartz lamps employed for medical purposes as they must invariably full the condition of causing no injury to the patient in case of breakage.

An effective safety device must be composed of a material which is permeable to the ultra-violet rays which are requiled When quartz lamps are used for medical purposes and moreover it must be arranged in such a manner that injury to the person by the falling of incandescent pieces of quartz )1' the escape of the hot mercury is prevented. Ihe object et the present invention is to fulfil these requirements.

In the drawings affixed to this specification and forming part thereo-f, a device embody ing 1n v invention is illustrated diagrammatically by way of example. In the draw- 1ngs- Fig. 1 is a longitudinal section, and

Fig. 2 a cross section of the burner of a quartz lamp with the safety device applied to it.

Reierringto the drawings, a, 54 are two pressed 1netal caps enclosing the pole chambers of the lampas closely as possible and out away to a semi-circular folm where the lighting tube is fitted. They serve.to support the semi-cylindrical quartz protecting trough 6 which may eithcr consist of com pletely clear material or which may be provided at the lower part 0 (Fig. 2) with a thin layer of milk-white quartz so that the most intense rays of light Which are emitted vertically downwards are somewhat screened. A milk-white glass more or less permeable to the ultra-violet raye may be employed in place of quartz.

'Ihe protecting device may, if desired, be formed as a tube wholly surrounding the lamp.

I wish it to be understood that I do not desire to be limited to the exact details0f construction shown and described, for obvious modifications Will occur to a person skilled in art.

I claim:

1. In a quartz lamp in combination, two pole ch2tmbers, a lighting tube extending substantially longitudinally intermediate said chambers, a metal cap below each pole chamber and a protective trough permeable to ultra violet rays supported by said caps and partly surrounding said tube.

2. In a quartz lamp in combination, two. pole chambers, a lighting tube extending substantially longitudinally intermediate said chambers, a metal cap below each polo chamber and a protective trough of quartz supported by said caps and partly surrounding said tube.

3. In a quartz lamp in combination, two pole chambers, a lighting tube extending substantially longitudinally intermediate said chambers, a metal cap below each pole chamber, a protective trough of clear quartz supported by said caps and partly surrounding said tube and a thin layer of translucent quartz on the bottom of said screen.

In testimony whereof I aflix 1ny signature.

FRITZ GIRARD. 

